EN 10085 Grade 34CrAlNi7 surface hardened
EN 10085 Grade 34CrAlNi7 surface hardened introduction
The nitriding steel 34CrAlNi7 can undergo quenchhardening and is used for heavy machine parts, piston rods, plunger pistons, spindles with particularly large dimensions.
The steel contains a nitride agent (Cr and Al) which contributes through the nitriding process or the nitro-carburization process with N or N and C to a higher:
- case hardness
- abrasion resistance
- fatigue strength
and
- corrosion resistance.
It is used for forged construction components: quench-hardened, mechanically processed and treated thermo-chemically (for example nitriding).
The steel with an increased Al-content is susceptible to increased case decarbonization. The forging requires sufficient additives for processing so that the finished construction component can undergo the nitriding process without decarburization.
Equivalent material: AFNOR 40CAD6-12, ASTM A355 Grade C, DIN 34CrAlNi7-10, DIN 1.8550, DIN 34CrAlNi7, EN 34CrAlNi7-10, EN 1.8550
EN 10085 Grade 34CrAlNi7 surface hardened general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.8 g/cm³ |
EN 10085 Grade 34CrAlNi7 surface hardened thermal
| Property |
Temperature |
Value |
| Coefficient of thermal expansion |
-100.0 °C |
Coefficient of thermal expansion of 1.05E-5 1/K |
| - |
20.0 °C |
Coefficient of thermal expansion of 1.15E-5 1/K |
| - |
100.0 °C |
Coefficient of thermal expansion of 1.21E-5 1/K |
| - |
200.0 °C |
Coefficient of thermal expansion of 1.27E-5 1/K |
| - |
300.0 °C |
Coefficient of thermal expansion of 1.32E-5 1/K |
| - |
400.0 °C |
Coefficient of thermal expansion of 1.36E-5 1/K |
| - |
500.0 °C |
Coefficient of thermal expansion of 1.4E-5 1/K |
| - |
600.0 °C |
Coefficient of thermal expansion of 1.44E-5 1/K |
| Specific heat capacity |
-100.0 °C |
Specific heat capacity of 423 J/(kg·K) |
| - |
20.0 °C |
Specific heat capacity of 461 J/(kg·K) |
| - |
100.0 °C |
Specific heat capacity of 479 J/(kg·K) |
| - |
200.0 °C |
Specific heat capacity of 499 J/(kg·K) |
| - |
300.0 °C |
Specific heat capacity of 517 J/(kg·K) |
| - |
400.0 °C |
Specific heat capacity of 536 J/(kg·K) |
| - |
500.0 °C |
Specific heat capacity of 558 J/(kg·K) |
| - |
600.0 °C |
Specific heat capacity of 587 J/(kg·K) |
| Thermal conductivity |
20.0 °C |
Thermal conductivity of 33.7 W/(m·K) |
| - |
100.0 °C |
Thermal conductivity of 36.2 W/(m·K) |
| - |
200.0 °C |
Thermal conductivity of 37.8 W/(m·K) |
| - |
300.0 °C |
Thermal conductivity of 37.2 W/(m·K) |
| - |
400.0 °C |
Thermal conductivity of 35.7 W/(m·K) |
| - |
500.0 °C |
Thermal conductivity of 34 W/(m·K) |
| - |
600.0 °C |
Thermal conductivity of 32 W/(m·K) |
| Thermal diffusivity |
20.0 °C |
Thermal diffusivity of 9.4 mm²/s |
| - |
100.0 °C |
Thermal diffusivity of 9.4 mm²/s |
| - |
200.0 °C |
Thermal diffusivity of 9.2 mm²/s |
| - |
300.0 °C |
Thermal diffusivity of 8.5 mm²/s |
| - |
400.0 °C |
Thermal diffusivity of 7.6 mm²/s |
| - |
500.0 °C |
Thermal diffusivity of 6.6 mm²/s |
| - |
600.0 °C |
Thermal diffusivity of 5.4 mm²/s |
EN 10085 Grade 34CrAlNi7 surface hardened chemical
| Property |
Value |
| Aluminium |
Aluminium of 0.8 - 1.2 % |
| Carbon |
Carbon of 0.3 - 0.37 % |
| Chromium |
Chromium of 1.5 - 1.8 % |
| Manganese |
Manganese of 0.4 - 0.7 % |
| Molybdenum |
Molybdenum of 0.15 - 0.25 % |
| Nickel |
Nickel of 0.85 - 1.15 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.03 % |
EN 10085 Grade 34CrAlNi7 surface hardened electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 3.09E-7 Ω·m |
| - |
100.0 °C |
Electrical resistivity of 3.54E-7 Ω·m |
| - |
200.0 °C |
Electrical resistivity of 4.18E-7 Ω·m |
| - |
300.0 °C |
Electrical resistivity of 5.05E-7 Ω·m |
| - |
400.0 °C |
Electrical resistivity of 6.09E-7 Ω·m |
| - |
500.0 °C |
Electrical resistivity of 7.27E-7 Ω·m |
| - |
600.0 °C |
Electrical resistivity of 8.67E-7 Ω·m |
EN 10085 Grade 34CrAlNi7 surface hardened mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
-100.0 °C |
Elastic modulus of 217 GPa |
- |
| - |
20.0 °C |
Elastic modulus of 212 GPa |
- |
| - |
100.0 °C |
Elastic modulus of 207 GPa |
- |
| - |
200.0 °C |
Elastic modulus of 199 GPa |
- |
| - |
300.0 °C |
Elastic modulus of 192 GPa |
- |
| - |
400.0 °C |
Elastic modulus of 184 GPa |
- |
| - |
500.0 °C |
Elastic modulus of 175 GPa |
- |
| - |
600.0 °C |
Elastic modulus of 164 GPa |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.3 [-] |
Typical for Steel |
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